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Investigations Of The Crystallization Processes Of Molecular Sieves, Lu Zhang

Electronic Thesis and Dissertation Repository

Molecular sieves have been used extensively in industrial fields. A better understanding of their crystallization processes is very useful for controlling the structural properties in order to meet the industrial needs. This thesis focuses on examining the crystallization of several catalytically important molecular sieves by dry gel conversion (DGC) method which includes steam-assisted conversion (SAC) and vapor-phase transport (VPT), or hydrothermal synthesis (HTS) method or a combination of both.

For SAPO-34 templated by DEA, it crystallizes similarly under SAC and VPT conditions. It forms from the transformation of a semi-crystalline layered phase. When morpholine was used as the template, the …